Add options to track to track association algorithm

[orosoman-dstl]

I've made some improvements to the track to track association algorithm. The main difference is extra parameters allowing the user to specify whether the entire StateVector should be used, or rather just positional elements given in the mapping parameter. The class was also renamed in anticipation of new T2TA algorithms in Stone Soup

[codecov]

Codecov Report

Merging #634 (d49d336) into main (c0bd5dd) will increase coverage by 0.00%.
The diff coverage is 87.50%.

@@           Coverage Diff           @@
##             main     #634   +/-   ##
=======================================
  Coverage   94.22%   94.23%           
=======================================
  Files         158      158           
  Lines        7833     7853   +20     
  Branches     1506     1513    +7     
=======================================
+ Hits         7381     7400   +19     
  Misses        343      343           
- Partials      109      110    +1     

Flag	Coverage Δ
integration	67.66% <15.62%> (-0.14%)	⬇️
unittests	91.99% <87.50%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
stonesoup/measures.py	98.70% <ø> (ø)
stonesoup/dataassociator/tracktotrack.py	90.13% <87.50%> (+0.73%)	⬆️

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[sdhiscocks]

There is already an ability to provide mappings to measures, and I think this should be used instead. This changes also removes the ability to provide a custom measure, which may be desirable.